Okay, I don't know your personal opinion or shows that you like, so I'll just write this for your essay.
To Cartoon Network,
I'm very distraught that you cancelled the show, Adventure Time, because I've been watching it for several years since I was younger. It's very nostalgic, and although I've grown out of cartoons and things, I'm close to this one.
I've watched it ever since I was around 3rd grade, and I fell in love with the show. The characters were likeable, it had a plot, and it had a sense of humor.
You should bring this back, because it's also one of the very few kids shows I've seen that have a lot of diversity, for example, two females characters are in a relationship, which teaches younger kids about LGBTQ+ and how it's not a bad thing.
In conclusion, this is a very good show, and I hate to see it gone. Please bring it back.
Sincerely, (Your name)